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Identify the standard deviation of the sampling distribution of xbar rounding to 4 decimal places (only give the numeric quantity, not the units)
In a random sample of 10 cell phone users, what is the probability that exactly 2 have used their phones to access the Internet? More than 2?
A random sample of 61 accounts were checked. The standard deviation was $286.20. At α= 0.01, test the firms' assumption. Assume the account balances are normally distributed.
Determine, with 95% confidence, if the stocks from "socially conscious" companies are different from the mean P/E ratio of all other major stocks. Please conduct a complete hypothesis test and find
What level of confidence did the statistician use in constructing this interval? Explain carefully, showing all steps in your reasoning.
Please conduct a complete hypothesis test to determine if Anthony Calvillo's passing performance in a given season does indeed exceed 3000 yards. Conduct this test at the 97.5% confidence level and
Determine the test statistic (Z* or t*) and the p-value for each of the each of the following situations and determine if they would cause the rejection of the null hypothesis if the confidence leve
if a machine was to be set at a mean output of 90 miles perhour (mph), its standard deviation would remain 4 mph. Assuming that actual speeds of the device are normally distributed, please answer th
If a researcher has 6 boxes of each, how many ways can he select 4 boxes, consisting of 2 boxes of regular and 2 boxes of diet, for a quality control test?
you have measured, you calculate an average length of 28 cm with a standard deviation of 6. Please construct a confidence interval for the mean length of the carrots using Gro-Haut in the following
The number in the first sample is fifteen and the number in the second sample is twelve. How many degrees of freedom are associated with the critical value?
The current balance of all credit card holders follows a normal distribution with unknown mean and known standard deviation of $90. what is the 99% confidence interval for the mean?
Over the course of a year, the manager of Motel St-Jacques, located in Brossard, Quebec, has noticed that on average, 180 rooms will be rented out every night, with a standard deviation of 15 rooms.
A test result x < 40 is an indication of severe excess insulin, and medication is usually prescribed. What is the probability that on a single test, x < 40?
You randomly select 15 single men from around Montreal and ask them if they would be comfortable with a woman asking them out for a date. If the claim made in the study was true, what is the probabi
Standard deviation of 0.01 inches. What is the probability that a randomly selected pencil will be less than 0.285 inches?
Is there enough evidence to reject the claim that the average cost of a home in both locations is the same? Use α = 0.01. Clearly mark each of the five steps in hypothesis testing.
The mean height of women in a country (age 20-29) is 64.3 inches. A random sample of 75 women in this age group is selected. what is the probablity that the mean height for the sample is greater tha
If he were to conduct a second study to reduce the maximum error of estimate to 6, about how many hard drives should he include in his new sample?
As part of an opinion survey, a simple random sample of 1,500 families is chosen. What is the chance that between 9% and 11% of the sample families will not own cars?
If a random sample of 8 adults is selected from the city, find the probability that exactly 3 adults respond that they enjoy using public transportation.
the probability that it gets by the first inspector is 0.1. Of those that get past the first inspector, the second inspector will miss 5 out of 10. What fraction of the defective items gets by both
Calculate the least square estimates of the slope and intercept. What is the estimate of σ2? Find the estimate of the mean deflection ifthe stress level can be limited to 69%.
here are 9 members on a board of directors. If they must elect a chairperson, secretary, and a treasury, how many different slates of candidates are possible?